Cool Internet Tool - Subway Navigator

Here's a cool tool I just discovered on Lifehacker, called Subway Navigator. You can look up the maps from subways in just about any city in the world. You can also choose your start and destination stations, and the navigator will tell you what trains and transfers to take to get there. However, like everything in life, it has one big flaw, no firefox support. IE and Netscape only (does anyone still use netscape?). Anyway, click the link to check out the site.